Article (Scientific journals)
Characterization of brown streak virus-resistant cassava.
Anjanappa, Ravi B.; Mehta, Devang; Maruthi, M. N. et al.
2016In Molecular Plant-Microbe Interactions
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Keywords :
virus; cassava; crop; resistance
Abstract :
[en] Cassava brown streak disease (CBSD) has become a major constraint to cassava production in East and Central Africa. The identification of new sources of CBSD resistance is essential to deploy CBSD mitigation strategies as the disease is progressing westwards to new geographical areas. A stringent infection method based on top cleft grafting combined with precise virus titer quantitation was utilized to screen fourteen cassava cultivars and elite breeding lines. When inoculated with mixed infections of Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV), the scions of elite breeding lines KBH 2006/18 and KBH 2006/26 remained symptom-free during a 16-week period of virus graft inoculation, while susceptible varieties displayed typical CBSD infection symptoms at 4 weeks after grafting. The identified CBSD resistance was stable under the co-inoculation of CBSV, UCBSV with cassava geminiviruses (CGMs). Double grafting experiments revealed that transmission of CBSV and UCBSV to CBSD susceptible top scions was delayed when using intermediate scions of elite breeding lines KBH 2006/18 and KBH 2006/26. Nonetheless, comparison of virus systemic movement using scions from KBH2006/18 and a transgenic CBSD resistant 60444 line (60444-Hp9 line) showed that both CBSV and UCBSV move at undetectable levels through the stems. Further, protoplast-based assays of virus titers showed that the replication of CBSVs is inhibited in the resistant line KBH2006/18, suggesting that the identified CBSD resistance is at least partially based on inhibition of virus replication. Our molecular characterization of CBSD resistance in cassava offers a robust virus-host system to further investigate the molecular determinants of CBSD resistance.
Disciplines :
Genetics & genetic processes
Author, co-author :
Anjanappa, Ravi B.
Mehta, Devang
Maruthi, M. N.
Kanju, Edward
Gruissem, Wilhelm
Vanderschuren, Hervé  ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Biologie végétale
Language :
English
Title :
Characterization of brown streak virus-resistant cassava.
Publication date :
2016
Journal title :
Molecular Plant-Microbe Interactions
ISSN :
0894-0282
eISSN :
1943-7706
Publisher :
American Phytopathological Society, United States - Minnesota
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 20 April 2016

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